Research conducted by Cindy Meston and David Buss, authors of “Why Women Have Sex”, revealed 200 different reasons. They interviewed 1000 women and after eliminating physical attraction, some interesting reasons where revealed.
Some of the more unusual reasons given to the researchers, where to get her husband to take out the garbage, to relieve the boredom, and to get rid of a headache. One woman said it is a spiritual experience. "It's the closest thing to God."
Then there are the reasons which most likely come to mind, such as a bargaining tool, sympathy, and because it is fun. Surprising to some was romance and passion where very low on the list of reasons.